Cu掺杂纳米TiO2光催化还原CO2实验研究

利用溶胶凝胶法制备不同掺杂量的CuO-TiO₂纳米粉体,采用热重差热分析仪（TG-DTA）,X射线衍射仪（XRD）,场发射扫描电镜（FSEM-EDX）等手段对其进行表征;在波长为253.7nm的紫外灯照射下,进行CO₂光催化还原实验研究,探究CO₂光催化资源化利用可行性,。结果表明,溶胶凝胶法制备所得CuO掺杂TiO₂纳米粉体,粒径大小在20～30 nm之间;CO₂光催化还原主要产物为甲醇,掺杂量为5%（质量分数）CnO-TiO₂纳米粉体催化效果最好,反应10 h后得到甲醇产量为27mg·（g-cata）^-1;随着反应时间的增加,产物中甲醇含量也逐渐增加。

Experiment Study on Photoreduction of CO2 Over Copper-Doped Titania Catalysts

Different doping concentration of copper-doped titania was synthesized by sol-gel method, and the samples were characterized by X-ray diffraction（XRD）;Field emission scanning electron microscope（FSEM -EDX）:Thermo gravimetric-differential thermal analyzer（TG-DTA） respectively. The photoreduction of CO₂ experiments was carried out in a photocatalytic reactor under UV irradiation at the wavelength of 253.7 nm for 10 h continuously.The results confirmed that in the copper modified TiO₂ samples,the crystalline form of TiO₂ exists as anatase;the grain size of all the sol-gel derived CuO-TiO₂ samples were nearly 30 nm,and the copper particles were consistent and dispersed on the surface of TiO₂.CO₂ can be reduced into methanol in the presence of NaHCO₃ solution over CuO-TiO₂ catalyst.The doping concentration of 5%CuO-TiO₂ performed best catalytic effect,with the methanol yield of 27 mg-（g-cata）^-1 in 10 h.With increasing reaction time,yield of methanol was promoted.